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MINI REVIEW article

Front. Oral. Health, 28 October 2022
Sec. Preventive Dentistry
Volume 3 - 2022 | https://doi.org/10.3389/froh.2022.980048

Management of dental caries lesions in patients with disabilities: Update of a systematic review

Gustavo Molina1,2* Mariana Zar2 Alison Dougall3 Colman McGrath4
  • 1Division of Restorative Dentistry, Faculty of Dentistry, The University of Hong Kong, Hong Kong, Hong Kong SAR, China
  • 2Department of Special Care Dentistry, The Dental School, Universidad Católica de Córdoba, Córdoba, Argentina
  • 3Special Care Dentistry, Dublin Dental Hospital, Trinity College, Dublin, Ireland
  • 4Applied Oral Sciences and Biomaterials, Faculty of Dentistry, Hong Kong University, Sai Ying Pun, Hong Kong SAR, China

The aim of this systematic review was to update an existing review on the management of dental caries lesions in patients with disabilities so as to provide an up-to-date summary of the evidence. Randomized clinical trials and cohort studies related to preventive and restorative programmes for dental caries among people requiring special care, published in English, Spanish, Portuguese, French and German languages from February 1st 2011 to April 1st 2022, were retrieved from three databases (“updated review”). From the 1,105 titles identified using the search topic “Caries AND Disability”, 17 papers informed in the analyses: 6 referring to caries preventive strategies and 11 related to restorative care strategies. Most of these studies targeted children and adults with intellectual/physical disability, although preventive and therapeutic strategies were also reported for frail older adults and onchohematological patients. Fluorides in tablets, gels or varnishes forms and the use of xylitol as a sugar substitute were reported as effective approach to prevent the onset of caries in high-risk groups. Minimally intervention treatment options such as the Hall technique, the ART approach and the use of SDF for arresting caries, were deemed suitable and effective strategies for treating existing lesions in-office. In conclusion, in the past decade (2011–2022) an increased number of articles reported strategies to prevent and manage caries among people requiring special care. Although an array of preventive and therapeutic strategies for dental caries exists, more and better-quality clinical evidence is needed to offer guidance to inform policy and practice for special care dentistry.

Introduction

In 2011, a systematic review regarding strategies to prevent and/or treat caries lesions in patients with disability concluded that more studies, and specifically more high-quality research was required to provide stronger scientific evidence to inform feasible and effective approaches to safeguard and improve the oral health of people requiring special care dentistry (1). The publication was a call for action to clinicians, researchers, and international oral health associations to spearhead the promotion of oral health, based on scientific evidence, for people with disability and medically compromised patients. Although the prevalence of caries is not necessarily higher among people with disabilities compared to the general population, it has been repeatedly described that people with disabilities have a higher number of untreated lesions, thus a higher unmet caries treatment needs as well as poorer oral hygiene and poorer periodontal status conditions than people without disabilities (2, 3).

In the last decade, in dentistry, major technical advances have led to improved quality of dental treatment and improved ability to maintain oral function and aesthetics over the life span. However, there are still gross and unfair inequalities in term of the quantity and the quality of dental treatment provided to people with disabilities. Special Care Dentistry is often perceived as the discipline of compromise—where “better than nothing” is the bottom line (4).

There is evidence that most but not all dental needs could be met in primary dental care settings (5). The problem for oral health care providers and governments is how to identify and select those who are best manged in the primary dental care setting and to decipher who needs additional specialist skills and adjuncts to receive and tolerate dental care. Furthermore, there is a need to ensure that such dental care is optimized and personalized to the patient's specific dental needs, considering that the scope of disability extends to a wide range of medical conditions that may compromise a “one-fits-all” approach of guidelines. Notwithstanding these considerations, references of best practices -targeting groups with similar characteristics- may help clinicians to offer their people with disabilities a variety of strategies that may suit them best to safeguard and improve their oral health.

The aim of this review was to update an existing review (1) on the management of dental caries lesions in patients with disabilities so as to provide an up-to-date summary of the evidence.

Materials and methods

PICO principle (Population, Intervention, Comparator, Outcome) was used to define the research question: What is the suitability and effectiveness of available strategies for preventing and/or treating caries lesions in people with disability?

Three electronic databases, the Cochrane Library database for Clinical Trials, PubMed and LILACS (Latin American and Caribbean Health Science Literature) were searched, and all publications listed in the databases from February 1st 2011 to April 1st 2022 were included. Different combinations of MeSH terms, limits and Boolean operators were tested to identify those that could include the highest number of relevant publications. The search strategy repeated the one that had been used in 2011 with a change in the dates for the search instead. Details of the search strategy for each database are described in Appendix 3.

Reference-linkage of review articles were used to identify additional relevant publications. In addition, hand searches of key publications were undertaken to identify other studies that had not been retrieved from the electronic databases search.

The inclusion criteria were with respect to three aspects:

1) Types of studies. Randomized controlled (clinical) trials and cohort studies on preventive and restorative intervention programmes published in English, Portuguese, Spanish, French and German languages were included. If only a relevant title without a listed abstract was available, a full copy of the article was obtained and assessed.

2) Type of participants. People of any age and gender, presenting any medical condition related to disability. The intention was to include publications having a control group, either with or without disability. Definition of a person with disability was adopted from the WHO-ICF (International Classification of Functioning, Disability and Health) (6) referring to people who experience the negative aspects of the interaction between their environmental and personal context and any functional impairments, activity limitations and participation restrictions that they may present (6).

3) Type of interventions. Preventive and/or restorative intervention programmes for managing dental caries including but not limited to the use of chemical products to control cariogenic bacteria, remineralizing agents, restorative and non-restorative options for caries treatment. Case reports, narrative reviews and epidemiological studies were excluded for their analysis.

Titles and abstracts were initially retrieved in duplicate by 2 reviewers (GFM and MZ) to identify potentially included studies, discussing eligibility until agreement was achieved by consensus. Data regarding authorship, study design, type of intervention and outcomes of the interventions were extracted from the articles independently and in duplicate and recorded into an excel spreadsheet.

Studies were assessed by two reviewers (GFM, MZ) and double-checked by the other two review authors (AD, CM). Disagreements among the reviewers were resolved through discussion until agreement was reached. Two reviewers (MZ, GFM) independently assessed the risk of bias of included RCTs using the Cochrane Collaboration's tool (7) and disagreements were resolved by consensus. Each study was judged and categorized as being of low, moderate, high or unclear risk of bias. Unclear risk of bias was assigned to indicate lack of information or uncertainty about the potential for bias.

GRADE criteria (Grading of Recommendations Assessment, Development, and Evaluation—GRADE approach) (8) was used to rate the certainty of the evidence, based on the assessment of the study design, risk of bias, imprecision, inconsistency, indirectness, and magnitude of effect of the articles.

Finally, included articles were categorized regarding the hierarchy of the level of evidence (9) (Appendix 2), a tool that had been used in the systematic review that is being updated in this article, to analyze whether the findings of this review have improved the quality of the publications compared to those articles retrieved in the previous review (1).

To report the outcomes of this systematic review the guidance from the PRISMA Checklist (10) (Appendix 1) was followed.

Analyses of data

Data were grouped in tables with a synoptic description of type of study, type of intervention and main outcomes to assess the relative effectiveness of each intervention. If studies reported dissimilar follow-up times or lacked a common comparator or if pairwise meta-analysis was not possible or failed to obtain measures of association, these data were reported as described by the primary study authors.

Quantitative analysis had been proposed by using Review Manager 5.3 software to compare studies using the same interventions and assessing the same outcomes by the same measurements. Meta-analysis were considered unfeasible for most of the outcomes due to the heterogeneity of the type of studies, participants and interventions, with a low number of strategies suitable for comparisons. A graphic showing the level of bias associated with each domain was obtained using this Cochrane software (Appendix 4).

Fixed effect model was applied if the total number of studies included in meta analysis was less than six studies (11). Due to lack of correlation in change from available studies, anticipated correlation of 0.5 was used to estimate the standard deviation of change (12). Continuity correction of 0.5 was applied if standard error cannot be computed due to estimated proportion is at 0 or 1 (13).

Finally, one-way ANOVA was used to analyze 5-year survival percentages among different restorative treatments.

Results

A flow diagram of the systematic search is presented in Appendix 5. After reaching an agreement on potential suitable titles/abstracts, 52 full articles regarding preventive and/or therapeutical caries management strategies were retrieved for analysis of which 35 were finally excluded. Reasons for exclusion were: (1) articles describing epidemiological studies (n = 8); (2) narrative articles (n = 10); (3) case reports (n = 7); (4) articles not related to the topic of this review (n = 8) and (5) systematic reviews (n = 2).

A total of 17 publications were suitable for final analyses: 6 related to caries-preventive programmes and 11 to restorative treatment programmes.

Caries-preventive strategies

Table 1 provides a summary of key information obtained from the included studies on caries preventive and therapeutic strategies. The level of the evidence of the included studies was rated between grades II and III-2, having included four RCTs (1417), one cluster RCT (18) and one longitudinal field trial (19). The sample size of these six studies presented a significant variation among them with an impact on to the quality of the evidence. A total number of 532 participants was followed up in 6 clinical trials, in most cases recruiting primarily children and adolescents with intellectual disability (ID), with the exception of one study that was conducted in a population with visual/hearing impairment.

TABLE 1
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Table 1. A summary of key information obtained from the included studies regarding preventive and therapeutic strategies for caries management in people with disabilities.

There was a significant heterogeneity in the type of interventions and conclusive results were of low certainty in most of studies.

Three studies introduced strategies that focused on how to effectively produce changes in attitudes and behavior towards oral health care, implemented in people with intellectual disability and autistic disorder spectrum. The study by Mun et al. (14) assessed the effectiveness of a dental hygiene care programme implemented by Dental Hygienists in a population with intellectual disability whereas the study by Fenning et al. (15) emphasized the importance of training the parents to improve oral hygiene standards in children with autistic spectrum disorders. Oral health variables such as plaque index or caries activity measured the impact of these strategies, reporting promising results for targeting special groups with individualized and creative methods (14, 15).

The third of these types of studies, followed the line of assessing caries risk to target individualized strategies to prevent the onset of the disease. The Cariogram assessment model (20) was adopted to follow up customized preventive programs in a population of 54 children with ID, adjusting different risk factors according to each child's situation to avoid the development of new lesions (19). Despite promising results of this aiding tool, details of specific strategies to modify the individuals’ caries risk were not provided in this study.

Two studies referenced the effectiveness of chemical agents for controlling cariogenic biofilm, confirming the evidence that fluorides in different concentrations and presentations (tablets, gels, varnishes and pastes) may be useful resources for preventing caries lesions (16, 17). Although chlorhexidine has been mentioned in one of these studies (17), the evidence of its effectiveness has of low quality and uncertain.

The use of xylitol chewing gums in a visual/hearing impaired school population was a successful strategy to relent DMFT scores after 1 year (18). More studies are needed to confirm of reject these findings in order to promote a generalized use of these sugar substitutes to prevent the onset of caries in people with disability.

Restorative/non-restorative treatment strategies

Table 1 provides a summary of key information obtained from the included studies on restorative treatment programmes. The quality of the included studies rated between level II and lV. Three RCT (one of them has two entrances for different types of outcomes) (2124), one pragmatic controlled clinical trial (25), one prospective cohort study (26), one retrospective audit (27), and four retrospective cohort studies (2831) reported the outcomes of different interventions that aimed to restore teeth affected by caries disease in patients with disability in time interval 2011–2022.

The use of minimally invasive strategies had a double purpose in this population: (1) maximal preservation of tooth structures and (2) to avoid interventions under GA as much as possible.

Following a gradient of complexity of the interventions, two studies reported that fluorides in high concentrations have shown to be effective products to arrest root caries lesions (22) as well as to prevent the progression of occlusal lesions in permanent molars, either using SDF or a combination of fluoride varnish sealed with a glass ionomer restorative cement (21). Although the two studies evaluated the ability to arrest the progression of caries lesions, they used different criteria to report caries arrestment rates, allowing no comparison between the outcomes obtained for each study.

The ART approach, employing high-viscosity glass ionomer cement as a restorative material, was tested in two of the included studies, seeking for alternatives to conventional restorative treatment that comprises the use of rotary instruments for caries removal. One of these clinical trials reported 76% acceptance and 100% satisfaction with this treatment modality in one article (23) and overall survival of 90.2% after 5 years in a separate paper (24). The other article on ART targeted a population of children undergoing oncohaematologic treatment and, although it was stated that this approach is suitable for this group of patients, a high number of restorations in need for repair was detected in a short period (1-year follow up) suggesting that these restorations needed a close and frequent follow up (25).

The decision of using either resin composite (RC) or glass ionomer (GI) as the restorative material of choice was also analyzed in a cohort study that evaluated survival of direct bonded restorations in frail older adults (30). Results showed no statistically significant differences between these two materials and overall survival rates of 60.5% after 5 years (30).

To overcome low survival rates of large restorations, another minimally invasive resource in this review was the Hall technique to arrest caries lesions in primary teeth of 16 children with learning disability. This prospective cohort study reported 100% survival, 80% acceptance and 96% satisfaction respectively (26).

A retrospective audit of interventions undertaken aided by GA revealed that resin composite restorations and stainless-steel crowns are the most frequently used resources to restore teeth affected by caries in the primary dentition whereas dental amalgam is the preferred restorative material chosen for the permanent dentition (27).

As regards to restorative treatment carried out under GA, high failure rates were observed in single surface restorations performed in primary molars under GA in one study (29). Another retrospective study carried out in the permanent dentition of patients with intellectual and/or physical disability reported 67.7% survival after 5 years of follow up (31). These results were obtained in non-endodontically treated teeth, whereas 89.8% survival and 86.4% success were reported for single-visit endodontic treatment and restoration in permanent teeth that received treatment under GA (28).

Finally, irrespective of the heterogeneity of the reports, a comparison of outcomes regarding survival of different types of restoration at different follow-up periods, determined that the Hall technique was 100% effective at an average of a 2-year period. No significant difference after 5 years was observed for ART/HVGIC, resin composite (RC) and root canal treatment followed by single-visit RC restoration in permanent teeth (90.2%, 89.8% and 89.8% respectively; p ≥ 0.05). Results obtained after 5 years were significantly different for resin composite restorations in two studies, being 89.8% (21) and 67.7% (28) respectively, the latter placed under GA exclusively.

With respect to multiple-surface restorations, similar results were obtained in two studies (24, 30) for glass ionomer cement (GIC) and RC after 5 years, ranging from 59.4% to 76.4% (p = 0.06). Standard deviations of these percentages explain there were no statistical differences among these outcomes.

The lowest percentages of survival were observed for restorations in primary teeth, either using GIC or RC.

Certainty of the evidence

The analyzes of the certainty of the evidence using GRADE criteria for outcomes across studies is summarized in Table 2. Five different outcomes were identified for the prevention of caries and two outcomes for therapeutic strategies in the studies that had been included. The number of studies per outcome and the heterogeneity of these studies allowed few statistical analyses, leading to weak recommendations based on the power of this evidence.

TABLE 2
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Table 2. Analysis of the certainty of the evidence by outcomes across studies based on GRADE criteria.

Discussion

Diversity is a distinctive feature that relates to the population of people with disability. The broad spectrum of medical conditions that are included within the scope of disability (32) creates a context of heterogeneity that makes it difficult to provide clear recommendations that might be suitable for the whole spectrum. However, if we addressed that the etiology of caries disease is universal, meaning that it may affect any person that ticks the necessary boxes of risks factors, we may assume that preventing caries would be a matter of avoiding such risks irrespective of any medical condition. The type of disability itself may comprise specific risks that must be disclosed and taken into consideration when planning a preventive programme (33). That seems to have been acknowledged in some of the studies retrieved for this review.

Recent systematic reviews that analyzed strategies for oral care in people with disabilities show that the introduction of different strategies to reduce the risk for the development of caries disease had been reported in clinical studies comparing their efficacy, such as the use of special/modified manual vs. electric or powered toothbrushes, oral hygiene training of carers and of people with disability and the frequency of supervised toothbrushing, as well as the impact of regularly scheduled visits plus supervised toothbrushing and the discussion of photographs as motivators for oral care (34, 35). Beyond the use of universal strategies that have proved to be effective for the general public, like the use of mechanical and chemical resources to control the cariogenic biofilm, insights of contextual (training of carers) and personal (training of patients, discussion of photographs as motivators) factors have been brought to the table to tackle the problem in daily actions that may successfully and sustainably prevent the onset of caries in this at-risk population.

Although the number of publications regarding preventive strategies for managing caries in people with disability included in the present review is somewhat low, noticeable is the trend of interdisciplinary approach in comparison to the updated review. The evaluation of these resources is highlighted as a new perspective for the prevention of the disease as such, irrespective of the use of specific products, focusing on a more up to date concept of caries and the factors that trigger the onset of the disease instead of the mere avoidance of cavities. In this regard, there seems to be a shift from -for instance- “using fluorides” to “how we introduce an effective and sustainable use of fluorides according to the characteristics of each group of patients within the spectrum”. Far from being a semantic discussion, authors believe this is a key innovative approach for an old situation of unmet needs. Therefore, interdisciplinary studies involving social sciences may provide the frame for supporting strategies that may effectively reach these patients.

Unfortunately, when the disease has been activated in the oral environment, efforts must be taken to reverse the situation while treating the lesions that develop in such a condition. For that purpose, cooperation of the patient to undertake either restorative or non-restorative interventions is essential to achieve sustainable outcomes. Probably due to the barriers to provide restorative care to this population, most of the participants included in the studies on therapeutic strategies were some types of “non-cooperative” patients, including intellectual and/or physically to medically compromised patients, ranging in age from children to frail older adults. This means that a broad scope of situations was covered by the umbrella of the designs of these studies. However, the type of intervention evaluated in each study was mainly focused on the most prevalent dental treatment needs for each stage of their lifespan and therefore, generalized strategies for all stages were difficult to retrieve due to this heterogeneity.

The tooth restorative cycle speed seems to be increase exponentially in high-risk patients and, at the same time, risk factors may be too difficult to approach in certain medical conditions or in people with behavior problems. Non or minimally invasive techniques may help to introduce more patient-friendly techniques without compromising the quality of the interventions as it has been shown in clinical studies using SDF or the ART approach (36, 37). However, longevity of the restorations, regardless of using resin composite or glass ionomer, may not achieve minimum standards and therefore, need to seek for better alternatives. Interestingly, failures occur equally for restorations either performed in-office or under sedation or GA, meaning that a different type of restoration which may withstand worse challenges in the oral cavity must be sought. The use of indirect restorations may be one option, including CAD-CAM resources, should be explored as a part of the arsenal of strategies that might be offered to people with disability if quality treatment becomes an irrefutable aim.

Although a higher number of suitable articles have been included for analysis in comparison to the previous review, the present study presents almost the same limitations, as there is still a lack of well-designed randomized clinical trials regarding both preventive and restorative approaches appropriate for use in patients with disabilities. RCTs are the most appropriate type of studies for the evaluation of clinical treatments and the introduction of new or modified dental materials prior to marketing (38). The control of bias and the equal distribution of known confounding factors between groups are among many advantages that this kind of study provides. However, some of its obvious disadvantages are related to the fact that it might take a long time to obtain outcomes and possibly a long time to enroll patients (9). Moreover, obtaining approval in Ethics Committees may discourage researchers for these endeavors or extend the times for developing the proposals extensively, leading to incomplete or low-quality protocols usually abandoned halfway.

In Disability and Oral Health, reports of clinical interventions are commonly restricted to isolated cases or case series that represent a lower level of evidence for their inclusion in a systematic review. This is a limiting aspect that has a significant impact on the construction of evidence-based guidelines for best practices in Special Care Dentistry. This issue has been discussed in the search of evidence for the use of dental implants among people with disabilities, but such controversies may also apply to Operative Dentistry as is the case of this review (39). Once again, these facts call for action. International organizations such as the International Association for Disability and Oral Health (IADH), the Special Care in Dentistry (SCD), the IADR, FDI and WHO, should give greater priority to the oral health of people with disabilities and measure core outcomes that are meaningful to them. Research methodology should be included or made mandatory in specialization courses for special needs dentists. Importantly, guidance should be provided regarding the development of an international agenda of relevant research topics and inclusive exclusion criteria should be scrutinized within ethics applications of ALL research studies to ensure that people with disabilities are only excluded with good reason in research studies which should reflect the diversity of the community (40). Furthermore, in view of the significant numbers of people with disabilities worldwide -over 1 billion people live with some form of disability; the number of people with disability are dramatically increasing due to demographic trends and increases in chronic health conditions, among other causes- (41), epidemiological data should always include those with disabilities and other hard to reach groups within their data collection. It is with great pleasure to notice that guidelines for carrying out research and for treating people with disability have been placed on the agenda of the forthcoming congresses of the IADH and SCD.

Conclusion

In the past decade (2011–2022) new evidence regarding the suitability and effectiveness of preventive and therapeutic strategies for managing caries lesions in people with disabilities has been published. There seems to be a shift in the focus of preventive strategies by introducing resources to effectively target special groups depending on their characteristics. For the restorative approach, minimally invasive strategies such as the use of SDF, ART and the Hall technique have demonstrated to be suitable and effective for the treatment of caries lesions both in primary and permanent teeth in office, thus reducing the need for interventions under general anesthesia. This review offers guidance to inform policy and practice for special care dentistry.

Author contributions

GM and CM contributed to the conception and design of the study; GM, CM, AD and MZ retrieved and selected the articles and analyzed the data. GM and MZ drafted the manuscript. All authors participated in the discussion of the manuscript until its last version and final approval was agreed to be accountable for all aspects of the work. All authors contributed to the article and approved the submitted version.

Funding

The processing charges of this journal will be covered using funds form the following grant: PRESTAMO BID-PROYECTO PICT 2020 SERIE A 00539 - FONCYT - AGENCIA NACIONAL DE PROMOCIÓN DE LA INVESTIGACIÓN, EL DESARROLLO TECNOLÓGICO Y LA INNOVACIÓN (ARGENTINA).

Acknowledgments

Authors are grateful to C.H. Chu and Duangporn Duganthip for encouraging the realization of this systematic review and to the International Association of Disability and Oral Health for its support and to Alejandra Bono, for their specialized advice regarding the methodology of systematic reviews.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

Supplementary material

The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/froh.2022.980048/full#supplementary-material.

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Keywords: disabled persons, dental care for disabled, systematic review, caries prevention, restorative care

Citation: Molina G, Zar M, Dougall A and McGrath C (2022) Management of dental caries lesions in patients with disabilities: Update of a systematic review. Front. Oral. Health 3:980048. doi: 10.3389/froh.2022.980048

Received: 28 June 2022; Accepted: 7 October 2022;
Published: 28 October 2022.

Edited by:

Yasmi O. Crystal, New York University, United States

Reviewed by:

Lucy OMalley, The University of Manchester, United Kingdom

© 2022 Molina, Zar, Dougall and McGrath. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Gustavo Molina molinagf@hku.hk

Specialty Section: This article was submitted to Preventive Dentistry, a section of the journal Frontiers in Oral Health

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